The nurse observes the presence of brittle, concave curves to the nails of a client on assessment. Which information should the nurse obtain from the client that may explain the appearance of the nails?

A. Coronary heart disease. While coronary heart disease can affect overall health, it is not typically associated with changes in nail shape. B. Recent candida infection. Candida infections can cause nail changes, but they usually result in discoloration and thickening rather than concave curves. C. Iron deficiency anemia. This is the best choice because iron deficiency anemia is commonly associated with koilonychia (spoon-shaped nails). D. Diabetes mellitus. Diabetes can cause various changes in skin and nails, but it is not typically associated with brittle, concave nails.